Feminism is the movement to end women’s oppression. One possible way to understand ‘woman’ in this claim is to take it as a sex term: ‘woman’ picks out human females and being a human female depends on various anatomical features (like genitalia). Historically many feminists have understood ‘woman’ differently: not as a sex term, but as a gender term that depends on social and cultural factors (like social position). In so doing, they distinguished sex (being female or male) from gender (being a woman or a man), although most ordinary language users appear to treat the two interchangeably. More recently this distinction has come under sustained attack and many view it nowadays with (at least some) suspicion. This entry (around 12 000 words in length) outlines and discusses distinctly feminist debates on sex and gender.